import json
import re

from django import http
from django.contrib.auth import login, authenticate, logout

from django.http import JsonResponse, HttpResponse
from django.shortcuts import render

# Create your views here.
# 前端：
# 用户输入用户名以后，然后输入框失去焦点 发送一个请求
# 路由地址  /usernames/用户名/count/
#
# 后端：
# 接收请求  ：收到用户名
# 业务逻辑   根据用户名查询数据库，查询数量，数量大于0说明已经注册过了
#
# 响应格式json
# {"count": 1, "code": "0", "errmsg": "OK"}
from django.views import View
from django_redis import get_redis_connection

from redis import Redis

from apps.users.models import User
from apps.users.utils import generate_verify_email_url,check_verify_email_token
from celery_tasks.email.tasks import send_email_active
from utils.views import LoginRequiredJSONMixin


class UsernameCountView(View):
    def get(self, request, username):
        # 1.接收 用户名
        print(username)
        # 2.根据用户名查询数据库，查询数量有几个
        try:
            count = User.objects.filter(username=username).count()
        except Exception as e:
            print(e)
            return JsonResponse({'code': '15', 'errmsg': '数据异常'})

        print("count=", count)
        #   - 3 返回json数据
        return JsonResponse({"count": count, "code": 1, "errmsg": "OK"})


class MobileCountView(View):
    "判断手机号是否重复注册"

    def get(self, request, mobile):
        count = User.objects.filter(mobile=mobile).count()
        return JsonResponse({'code': 0, 'errmsg': 'OK', 'count': count})


class RegisterView(View):
    def post(self, request):
        # 接收数据 获取到json数据
        body_byte = request.body
        # 把byte类型的json数据  转为字典
        data_dict = json.loads(body_byte)
        username = data_dict.get('username')
        password = data_dict.get('password')
        password2 = data_dict.get('password2')
        mobile = data_dict.get('mobile')
        sms_code = data_dict.get('sms_code')
        allow = data_dict.get('allow')

        # 验证数据 （数据不能为空 数据正则的验证）
        # all 里面传的列表的数据里 只要有一个是False 结果就是False
        # 判断参数是否齐全
        if not all([username, password, password2, mobile, allow]):
            return http.JsonResponse({'code': 400, 'errmsg': '缺少必传参数!'})
        # 判断用户名是否是5-20个字符
        if not re.match(r'^[a-zA-Z0-9_]{5,20}$', username):
            return http.JsonResponse({'code': 400, 'errmsg': 'username格式有误!'})
        # 判断密码是否是8-20个数字
        if not re.match(r'^[0-9A-Za-z]{8,20}$', password):
            return http.JsonResponse({'code': 400, 'errmsg': 'password格式有误!'})
        # 判断两次密码是否一致
        if password != password2:
            return http.JsonResponse({'code': 400, 'errmsg': '两次输入不对!'})
        # 判断手机号是否合法
        if not re.match(r'^1[3-9]\d{9}$', mobile):
            return http.JsonResponse({'code': 400, 'errmsg': 'mobile格式有误!'})
        # 判断是否勾选用户协议
        if allow != True:
            return http.JsonResponse({'code': 400, 'errmsg': 'allow格式有误!'})

        # 判断短信验证码是否正确
        # - 1 从redis取短信验证码 不要忘记decode
        redis: Redis = get_redis_connection('code')
        sms_code_redis = redis.get('smscode_%s' % mobile)
        # - 2 如果没取到 说明 过期了 ，返回错误
        if not sms_code_redis:
            return JsonResponse({'code': 400, 'errmsg': '验证码过期'})
        # - 3 和用户发来的对比
        sms_code_redis = sms_code_redis.decode()
        if sms_code != sms_code_redis:
            return JsonResponse({'code': 400, 'errmsg': '验证码输入错误'})

        try:
            user = User.objects.create_user(username=username, password=password, mobile=mobile)
        except Exception as e:
            print(e)
            return JsonResponse({'code': 400, 'errmsg': '注册失败!'})
        # 把用户信息保存到session
        login(request, user)
        response = JsonResponse({'code': 0, 'errmsg': '注册成功!'})
        response.set_cookie('username', user.username, max_age=3600 * 24 * 15)
        return response


class LoginView(View):
    def post(self, request):
        # 1.接收json数据
        body = request.body
        data_dict = json.loads(body)
        username = data_dict.get('username')
        password = data_dict.get('password')
        remembered = data_dict.get('remembered')

        # 2 验证数据是否为空  正则
        if not all([username, password, remembered]):
            return JsonResponse({'code': 400, 'errmsg': '写错了'})

        import re
        if re.match('^1[3-9]\d{9}$', username):
            # 手机号
            User.USERNAME_FIELD = 'mobile'
        else:
            # account 是用户名
            # 根据用户名从数据库获取 user 对象返回.
            User.USERNAME_FIELD = 'username'

        # 3 验证码用户名和密码是否正确
        user = authenticate(username=username, password=password)
        if not user:
            return JsonResponse({'code': 400, 'errmsg': '用户名密码错误'})

        # 4 状态保持
        login(request, user)

        # 5 判断是否记住登录
        if remembered:
            # 如果记住:  设置为两周有效
            request.session.set_expiry(None)
        else:
            # 如果没有记住: 关闭立刻失效
            request.session.set_expiry(0)
        # 6 返回响应
        response = JsonResponse({'code': 0, 'errmsg': 'ok'})
        # 注册时用户名写入到cookie，有效期15天
        response.set_cookie('username', user.username, max_age=3600 * 24 * 15)
        return response


class LogoutView(View):
    """退出登录"""

    def delete(self, request):
        """实现退出登录逻辑"""
        # 清理session
        logout(request)
        # 退出登录，重定向到登录页
        response = JsonResponse({'code': 0,
                                 'errmsg': 'ok'})
        # 退出登录时清除cookie中的username
        response.delete_cookie('username')

        return response


class UserInfoView(LoginRequiredJSONMixin, View):
    """用户中心"""

    def get(self, request):
        print(request.user.username)
        print(request.user.mobile)
        """提供个人信息界面"""
        return JsonResponse({
            'code': 0,
            'errmsg': 'ok',
            'info_data': {"username": request.user.username,
                          "mobile": request.user.mobile,
                          "email": request.user.email,
                          "email_active": request.user.email_active},


        })

# 添加邮箱的视图
class SaveEmailView(LoginRequiredJSONMixin, View):
    def put(self, request, sendmail=None):
        #  1 获取json数据 转为字典
        body = request.body
        data_dict = json.loads(body)

        #  2 从字典里拿到邮箱地址
        email = data_dict.get('email')
        #  3 校验
        if not email:
            return JsonResponse({'code': 300, 'errmsg': '邮箱不存在'})
        #  4 保存到数据库
        try:
            request.user.email = email
            request.user.save()
        except Exception as e:
            print(e)
            return JsonResponse({'code': 400, 'errmsg': '邮箱保存失败'})

        # 异步发送认证邮件
        # 163 126  qq  sina  gmail

        verify_url = generate_verify_email_url(request.user)
        message = '<p>尊敬的用户您好！</p>' \
                       '<p>感谢您使用美多商城。</p>' \
                       '<p>您的邮箱为：%s 。请点击此链接激活您的邮箱：</p>' \
                       '<p><a href="%s">%s<a></p>' % (email, verify_url, verify_url)
        send_email_active.delay(email,message)


        #  5 返回相应
        return JsonResponse({'code': 0, 'errmsg': 'ok'})

class EmailVerifyView(View):
    def put(self, request):
        # - 1 接收请求（PUT）数据
        # - 2 获取token
        token = request.GET.get('token')
        # - 3 对token解密 获取解密数据里的user_id
        user_id=check_verify_email_token(token)

        if not user_id:
            return JsonResponse({'code': 400, 'errmsg': '激活邮件已经过期'})


        try:
            user = User.objects.get(id=user_id)
        except Exception as e:
            print(e)
            return JsonResponse({'code': 400, 'errmsg': '当前用户不存在'})

        user.email_active = True
        user.save()
        return JsonResponse({'code': 0, 'errmsg': '激活成功!'})
